This why Yahoo Windows Live, Hotmail or Outlook users should never click on a link in an email message to sign into their accounts. They should always go directly to mail.yahoo.com and sign in from there instead. Once they have signed in, they will be alerted to important notifications or changes, if there are any.
The "Yahoo This Email Account Will Be Disable" Scam
From: Yahoo Account <firstname.lastname@example.org>
Date: December 12, 2019 at 9:02:16 AM MST
Subject: * Last warning * This email account will be disable
Dear Mail User,
Access to e-mail is about to expire, While Yahoo systems were affected, we may take extra precaution and lock user accounts when we detect unusual activity. Please open the attachment to upgrade your account or your mailbox will be fully terminated.
These service is free.
Yahoo Mail Team
Thank You. Yahoo Inc